GST cookbook - Revision history

GChriss: Add section on running post-recording video filter

2018-06-15T18:32:49Z

Add section on running post-recording video filter

← Older revision		Revision as of 18:32, 15 June 2018
Line 110:		Line 110:
	*Set the camera to 2592x1120 @ 18FPS. Adjust camera controls to ensure the camera achieves this framerate.		*Set the camera to 2592x1120 @ 18FPS. Adjust camera controls to ensure the camera achieves this framerate.
	*gst-launch-1.0 -e rtspsrc location=rtsp://192.168.0.9:554 latency=100 ! queue max-size-bytes=100000000 max-size-time=0 ! rtpjpegdepay ! queue max-size-bytes=100000000 max-size-time=0 ! jpegdec ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! "video/x-raw,framerate=(fraction)30/1" ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! "video/x-raw,width=640,height=480" ! queue max-size-bytes=100000000 max-size-time=0 ! videoconvert ! "video/x-raw,format=(string)YUY2,pixel-aspect-ratio=(fraction)1/1" ! tee ! queue max-size-bytes=100000000 max-size-time=0 ! v4l2sink device=/dev/video0		*gst-launch-1.0 -e rtspsrc location=rtsp://192.168.0.9:554 latency=100 ! queue max-size-bytes=100000000 max-size-time=0 ! rtpjpegdepay ! queue max-size-bytes=100000000 max-size-time=0 ! jpegdec ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! "video/x-raw,framerate=(fraction)30/1" ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! "video/x-raw,width=640,height=480" ! queue max-size-bytes=100000000 max-size-time=0 ! videoconvert ! "video/x-raw,format=(string)YUY2,pixel-aspect-ratio=(fraction)1/1" ! tee ! queue max-size-bytes=100000000 max-size-time=0 ! v4l2sink device=/dev/video0
	*Launch pipeline above then run video-conferencing software (e.g., Firefox Hello, Skype, Google[+] Hangouts)		*Launch pipeline above then run video-conferencing software (''e.g.'', Firefox Hello, Skype, Google[+] Hangouts)
	*Synchronized audio ''via'' the v4l2 API is untested -- select an ALSA audio source as appropriate.		*Synchronized audio ''via'' the v4l2 API is untested -- select an ALSA audio source as appropriate.
	*It may be helpful to re-nice video processes to '-15'.		*It may be helpful to re-nice video processes to '-15'.
Line 148:		Line 148:
	*Generally compatible with [http://mediagoblin.org/ MediaGoblin]		*Generally compatible with [http://mediagoblin.org/ MediaGoblin]
	exiftool -Author='Your name' -Copyright='copyright license + URL' -make='Elphel Inc.' -model='Elphel NC353L-12V' -Xresolution=72 -Yresolution=72 -resolutionunit=inches -flash#=0x0020 -DateTimeOriginal='2012:05:04 10:00:00-5' -exposuremode='Manual' -FNumber='1.4' -UserComment='Lens or adapter used, or other notes' -GPSLatitude=42.36160 -GPSLatitudeRef=N -GPSLongitude=71.09064 -GPSLongitudeRef=W -overwrite_original .jpg		exiftool -Author='Your name' -Copyright='copyright license + URL' -make='Elphel Inc.' -model='Elphel NC353L-12V' -Xresolution=72 -Yresolution=72 -resolutionunit=inches -flash#=0x0020 -DateTimeOriginal='2012:05:04 10:00:00-5' -exposuremode='Manual' -FNumber='1.4' -UserComment='Lens or adapter used, or other notes' -GPSLatitude=42.36160 -GPSLatitudeRef=N -GPSLongitude=71.09064 -GPSLongitudeRef=W -overwrite_original .jpg

			===Dump all JPEGs from Matroska+M-JPEG video, run various G'MIC filters (''e.g.'', de-blur), then recreate video===
			*gst-launch-1.0 filesrc location=elphel_recording_.mkv ! queue ! matroskademux ! queue ! multifilesink location="image_%04d.jpg"

			Run a mild de-blur filter (slow processing) on all frames:
			for i in jpg; do mv $i tmp.jpg ; gmic tmp.jpg +fx_deblur 1.36,6,17.5,0.3,1,0,0,24,0 -o[1] $i; done

			Re-create the video using the image-corrected JPEGs, coping the original audio track:
			*gst-launch-1.0 matroskamux name=mux ! queue ! filesink location=elphel_recording_corrected.mkv multifilesrc location="elphel_recording_%04d.jpg" caps="image/jpeg,framerate=18/1,pixel-aspect-ratio=1/1" ! queue ! jpegdec ! queue ! jpegenc ! mux. filesrc location=moon.mkv ! queue ! matroskademux ! queue ! vorbisdec ! queue ! vorbisenc ! queue ! mux.
			'''TODO''': Figure out how to avoid decoding/re-encoding audio and video -- should not be a necessary step


	===[https://github.com/timvideos/HDMI2USB HDMI2USB] (timvideos.us) capture with ALSA audio input===		===[https://github.com/timvideos/HDMI2USB HDMI2USB] (timvideos.us) capture with ALSA audio input===

Martin.leese: /* Two v4l2 sources combined side-by-side into rectangular video + ALSA -> Ogg Theora -> IceCast */ IceCast => Icecast

2016-04-09T17:17:24Z

Two v4l2 sources combined side-by-side into rectangular video + ALSA -> Ogg Theora -> IceCast: IceCast => Icecast

← Older revision		Revision as of 17:17, 9 April 2016
Line 41:		Line 41:
	:Note that the above pipeline will slowly lose audio/video synchronization due to hardware-level limitations in audio vs. video capture of media samples. FireWire and SDI-based capture does not have these limitations.		:Note that the above pipeline will slowly lose audio/video synchronization due to hardware-level limitations in audio vs. video capture of media samples. FireWire and SDI-based capture does not have these limitations.

	===Two v4l2 sources combined side-by-side into rectangular video + ALSA -> Ogg Theora -> ~~IceCast~~===		===Two v4l2 sources combined side-by-side into rectangular video + ALSA -> Ogg Theora -> Icecast===
	*mplayer tv:// -tv device=/dev/video0:driver=v4l2:norm=NTSC:width=320:height=240:outfmt=uyvy:input=1:buffersize=16: -ao null		*mplayer tv:// -tv device=/dev/video0:driver=v4l2:norm=NTSC:width=320:height=240:outfmt=uyvy:input=1:buffersize=16: -ao null
	*mplayer tv:// -tv device=/dev/video1:driver=v4l2:norm=NTSC:width=320:height=240:outfmt=uyvy:input=1:buffersize=16: -ao null		*mplayer tv:// -tv device=/dev/video1:driver=v4l2:norm=NTSC:width=320:height=240:outfmt=uyvy:input=1:buffersize=16: -ao null

Martin.leese: /* Pull from a windows media stream, transcode to Ogg/Theora+Vorbis and send to a Icecast server: */ a => an

2016-04-09T17:14:22Z

Pull from a windows media stream, transcode to Ogg/Theora+Vorbis and send to a Icecast server:: a => an

← Older revision		Revision as of 17:14, 9 April 2016
Line 28:		Line 28:
	*gst-launch-0.10 filesrc location="INPUT.y4m" ! decodebin ! schroenc force-profile=vc2_main rate-control=lossless ! oggmux ! filesink location="OUTPUT.ogv"		*gst-launch-0.10 filesrc location="INPUT.y4m" ! decodebin ! schroenc force-profile=vc2_main rate-control=lossless ! oggmux ! filesink location="OUTPUT.ogv"

	===Pull from a windows media stream, transcode to Ogg/Theora+Vorbis and send to a Icecast server:===		===Pull from a windows media stream, transcode to Ogg/Theora+Vorbis and send to an Icecast server:===
	(may require purchasing Fluendo plugins for decoding the encumbered codecs)		(may require purchasing Fluendo plugins for decoding the encumbered codecs)
	*gst-launch-0.10 uridecodebin uri=mms://SOURCE.SERVER.COM/path name=d ! queue max-size-time=100000000 ! ffmpegcolorspace ! theoraenc bitrate=800 ! oggmux name=mux ! shout2send ip=YOURICECAST.SERVER.COM port=8000 password=YOURPASSWORD mount=/OUTPUTFILENAME.ogv d. ! queue max-size-time=100000000 ! audioconvert ! vorbisenc ! mux.		*gst-launch-0.10 uridecodebin uri=mms://SOURCE.SERVER.COM/path name=d ! queue max-size-time=100000000 ! ffmpegcolorspace ! theoraenc bitrate=800 ! oggmux name=mux ! shout2send ip=YOURICECAST.SERVER.COM port=8000 password=YOURPASSWORD mount=/OUTPUTFILENAME.ogv d. ! queue max-size-time=100000000 ! audioconvert ! vorbisenc ! mux.

GChriss: clearly differentiate between 0.10 and 1.0 pipelines

2016-04-08T21:33:44Z

clearly differentiate between 0.10 and 1.0 pipelines

GChriss: /* Generate Ogg Vorbis Audio from MP4 Video: */ new section: found this helpful in generating audio from YouTube-downloaded MP4

2016-04-08T21:25:35Z

Generate Ogg Vorbis Audio from MP4 Video:: new section: found this helpful in generating audio from YouTube-downloaded MP4

← Older revision		Revision as of 21:25, 8 April 2016
Line 18:		Line 18:
	===Dump a Theora video to PNGs:===		===Dump a Theora video to PNGs:===
	*gst-launch filesrc location="INPUT.ogv" ! oggdemux ! theoradec ! ffmpegcolorspace ! pngenc snapshot=false ! multifilesink location="OUTPUT%04d.png"		*gst-launch filesrc location="INPUT.ogv" ! oggdemux ! theoradec ! ffmpegcolorspace ! pngenc snapshot=false ! multifilesink location="OUTPUT%04d.png"

			===Generate Ogg Vorbis Audio from MP4 Video (+Progress Monitoring)===
			gst-launch-1.0 filesrc location=original.mp4 ! queue max-size-time=0 max-size-bytes=100000000 ! qtdemux name=demux ! progressreport update-freq=5 demux.audio_0 ! queue ! decodebin ! queue ! audioconvert ! queue ! vorbisenc ! queue ! oggmux ! queue ! filesink location=vorbis-audio.oga

	===Transmux a MKV (containing vorbis and theora) to Ogg:===		===Transmux a MKV (containing vorbis and theora) to Ogg:===

GChriss: new subsection: mkvmerge video clip extraction via timecode

2016-03-09T03:32:16Z

new subsection: mkvmerge video clip extraction via timecode

← Older revision		Revision as of 03:32, 9 March 2016
Line 127:		Line 127:
	*[TODO: create a BASH script or similar for the next step]		*[TODO: create a BASH script or similar for the next step]
	exiftool -DateTimeOriginal="`date -d @start-of-recording_unixtimestamp+offset-for-this-image-from-log-file --rfc-3339=seconds`" -overwrite_original .jpg		exiftool -DateTimeOriginal="`date -d @start-of-recording_unixtimestamp+offset-for-this-image-from-log-file --rfc-3339=seconds`" -overwrite_original .jpg

			====Extract video clips using specified timecodes====
			*mkvmerge --split parts:hh:mm:ss-hh:mm:ss -o clip.mkv recording.mkv
			*Requires recent builds of MKVToolNix
			*With short-duration time codes, extract ''all'' frames from the generated clip using the above GST pipeline for "frame-by-frame" still selection
			*Also generally helpful to split long recordings into manageable sections for further editing

	====Run color-correction on the extracted JPEGs with G'MIC====		====Run color-correction on the extracted JPEGs with G'MIC====

GChriss: /* Extract a series of individual JPEGs from Matroska+M-JPEG video into a folder and monitor progress in "fast forward" mode */ "blah" -> "image"

2016-03-07T03:42:05Z

Extract a series of individual JPEGs from Matroska+M-JPEG video into a folder and monitor progress in "fast forward" mode: "blah" -> "image"

← Older revision		Revision as of 03:42, 7 March 2016
Line 119:		Line 119:

	===Extract a series of individual JPEGs from Matroska+M-JPEG video into a folder and monitor progress in "fast forward" mode===		===Extract a series of individual JPEGs from Matroska+M-JPEG video into a folder and monitor progress in "fast forward" mode===
	*GST_DEBUG=GST_BUS:5 gst-launch-1.0 filesrc location=recording.mkv ! queue ! matroskademux ! queue ! videorate ! image/jpeg,framerate=1/5 ! queue ! tee name=split ! jpegdec ! queue ! videoconvert ! queue ! xvimagesink sync=false split. ! multifilesink post-messages=true location="~~blah_~~%04d.jpg" sync=false &>gst-bus-debug.log		*GST_DEBUG=GST_BUS:5 gst-launch-1.0 filesrc location=recording.mkv ! queue ! matroskademux ! queue ! videorate ! image/jpeg,framerate=1/5 ! queue ! tee name=split ! jpegdec ! queue ! videoconvert ! queue ! xvimagesink sync=false split. ! multifilesink post-messages=true location="image_%04d.jpg" sync=false &>gst-bus-debug.log
	*Remove any colons in input filenames to avoid BASH interpretation issues		*Remove any colons in input filenames to avoid BASH interpretation issues
	*Change the framerate to control the time interval between image stills and number of produced stills. "1/5" translates to "one image per five seconds of video."		*Change the framerate to control the time interval between image stills and number of produced stills. "1/5" translates to "one image per five seconds of video."

GChriss: /* Extract a series of individual JPEGs from Matroska+M-JPEG into a folder */ expand pipeline to provide visual fast-forward

2016-03-04T05:34:23Z

Extract a series of individual JPEGs from Matroska+M-JPEG into a folder: expand pipeline to provide visual fast-forward

← Older revision		Revision as of 05:34, 4 March 2016
Line 118:		Line 118:
	*Open with GIMP		*Open with GIMP

	===Extract a series of individual JPEGs from Matroska+M-JPEG into a folder===		===Extract a series of individual JPEGs from Matroska+M-JPEG video into a folder and monitor progress in "fast forward" mode===
	*GST_DEBUG=GST_BUS:5 gst-launch-1.0 filesrc location=recording.mkv ! queue ! matroskademux ! queue ! videorate ! image/jpeg,framerate=1/10 ! queue ! multifilesink location="~~recording_~~%04d.jpg" sync=false 2>gst-bus-debug.log		*GST_DEBUG=GST_BUS:5 gst-launch-1.0 filesrc location=recording.mkv ! queue ! matroskademux ! queue ! videorate ! image/jpeg,framerate=1/5 ! queue ! tee name=split ! jpegdec ! queue ! videoconvert ! queue ! xvimagesink sync=false split. ! multifilesink post-messages=true location="blah_%04d.jpg" sync=false &>gst-bus-debug.log
	*Remove any colons input filenames to avoid BASH issues		*Remove any colons in input filenames to avoid BASH interpretation issues
	*Change the framerate to control the time interval between image stills and number of produced stills		*Change the framerate to control the time interval between image stills and number of produced stills. "1/5" translates to "one image per five seconds of video."
	<br />		<br />
	*~~After the above command is run the images should be generated.~~ To add EXIF timestamps to ~~each JPG~~:		*To add EXIF timestamps to individual JPGs:
	cat gst-bus-debug.log \| grep timestamp \| grep dispatch \| sed -e s/^.filename[=].string.//g -e s/..stream.time.//g -e s/[,].\)/=/g -e s/000000000//g >timestamps.log		cat gst-bus-debug.log \| grep timestamp \| grep dispatch \| sed -e s/^.filename[=].string.//g -e s/..stream.time.//g -e s/[,].\)/=/g -e s/000000000//g >timestamps.log
	*[TODO: create a BASH script or similar for the next step]		*[TODO: create a BASH script or similar for the next step]
Line 132:		Line 132:
	<br />		<br />
	for i in jpg; do mv $i tmp.jpg ; gmic tmp.jpg --balance_gamma 68,68,68 -o[1] $i,90; done		for i in jpg; do mv $i tmp.jpg ; gmic tmp.jpg --balance_gamma 68,68,68 -o[1] $i,90; done
	*The specified reference color must be in RGB, not ~~hex~~. Use the gimp-gmic plugin to interactively find values that work well for your photoset.		*The specified reference color must be in RGB, not hexadecimal. Use the gimp-gmic plugin to interactively find values that work well for your particular photoset.

	===Add EXIF Metadata to generated image stills===		===Add EXIF Metadata to generated image stills===

GChriss: /* Extract a series of individual JPEGs from Matroska+M-JPEG into a folder */ re-add debug part for EXIF timestamps

2016-03-03T18:19:16Z

Extract a series of individual JPEGs from Matroska+M-JPEG into a folder: re-add debug part for EXIF timestamps

← Older revision		Revision as of 18:19, 3 March 2016
Line 119:		Line 119:

	===Extract a series of individual JPEGs from Matroska+M-JPEG into a folder===		===Extract a series of individual JPEGs from Matroska+M-JPEG into a folder===
	*gst-launch-1.0 filesrc location=recording.mkv ! queue ! matroskademux ! queue ! videorate ! image/jpeg,framerate=1/10 ! queue ! multifilesink location="recording_%04d.jpg" sync=false		*GST_DEBUG=GST_BUS:5 gst-launch-1.0 filesrc location=recording.mkv ! queue ! matroskademux ! queue ! videorate ! image/jpeg,framerate=1/10 ! queue ! multifilesink location="recording_%04d.jpg" sync=false 2>gst-bus-debug.log
	*Remove any colons input filenames to avoid BASH issues		*Remove any colons input filenames to avoid BASH issues
	*Change the framerate to control the time interval between image stills and number of produced stills		*Change the framerate to control the time interval between image stills and number of produced stills

GChriss: /* Extract a series of individual JPEGs from Matroska+M-JPEG into a folder */ update extraction pipeline for gst-launch-1.0

2016-03-03T18:04:14Z

Extract a series of individual JPEGs from Matroska+M-JPEG into a folder: update extraction pipeline for gst-launch-1.0

← Older revision		Revision as of 18:04, 3 March 2016
Line 119:		Line 119:

	===Extract a series of individual JPEGs from Matroska+M-JPEG into a folder===		===Extract a series of individual JPEGs from Matroska+M-JPEG into a folder===
	*~~GST_DEBUG=GST_BUS:5~~ gst-launch-0~~.10~~ filesrc location=recording.mkv ! queue ! matroskademux ! queue ! videorate ! image/jpeg,framerate=1/10 ! queue ! multifilesink ~~post-messages=true~~ location="~~image~~%04d.jpg" sync=false ~~2>gst-bus-debug.log~~		*gst-launch-1.0 filesrc location=recording.mkv ! queue ! matroskademux ! queue ! videorate ! image/jpeg,framerate=1/10 ! queue ! multifilesink location="recording_%04d.jpg" sync=false
	*Remove any colons input filenames to avoid BASH issues		*Remove any colons input filenames to avoid BASH issues
	*Change the framerate to control the time interval between image stills and number of produced stills		*Change the framerate to control the time interval between image stills and number of produced stills

← Older revision		Revision as of 21:33, 8 April 2016
Line 5:		Line 5:
	Texas Instruments offers a [http://processors.wiki.ti.com/index.php/Example_GStreamer_Pipelines list of example pipelines] for TI mobile devices.		Texas Instruments offers a [http://processors.wiki.ti.com/index.php/Example_GStreamer_Pipelines list of example pipelines] for TI mobile devices.

	Hold down the 'control' key in combination with BASH cursor-left (left arrow) or cursor-right (right arrow) to quickly edit the commands listed here.		Hold down the 'control' key in combination with BASH cursor-left (left arrow) or cursor-right (right arrow) to quickly edit the commands listed here. Note that GStreamer 0.10 (gst-launch-'''0.10''') has been deprecated for several years and that use of the newer 1.x series (gst-launch-'''1.0''') is strongly recommended.

	__TOC__		__TOC__
Line 14:		Line 14:

	===Encode a .wav to Vorbis:===		===Encode a .wav to Vorbis:===
	*gst-launch filesrc location="INPUT.wav" ! wavparse ! audioconvert ! vorbisenc ! oggmux ! filesink location="OUTPUT.ogg"		*gst-launch-0.10 filesrc location="INPUT.wav" ! wavparse ! audioconvert ! vorbisenc ! oggmux ! filesink location="OUTPUT.ogg"

	===Dump a Theora video to PNGs:===		===Dump a Theora video to PNGs:===
	*gst-launch filesrc location="INPUT.ogv" ! oggdemux ! theoradec ! ffmpegcolorspace ! pngenc snapshot=false ! multifilesink location="OUTPUT%04d.png"		*gst-launch-0.10 filesrc location="INPUT.ogv" ! oggdemux ! theoradec ! ffmpegcolorspace ! pngenc snapshot=false ! multifilesink location="OUTPUT%04d.png"

	===Generate Ogg Vorbis ~~Audio~~ from MP4 ~~Video~~ (+~~Progress Monitoring~~)===		===Generate Ogg Vorbis audio from MP4 video (+progress monitoring)===
	gst-launch-1.0 filesrc location=original.mp4 ! queue max-size-time=0 max-size-bytes=100000000 ! qtdemux name=demux ! progressreport update-freq=5 demux.audio_0 ! queue ! decodebin ! queue ! audioconvert ! queue ! vorbisenc ! queue ! oggmux ! queue ! filesink location=vorbis-audio.oga		gst-launch-1.0 filesrc location=original.mp4 ! queue max-size-time=0 max-size-bytes=100000000 ! qtdemux name=demux ! progressreport update-freq=5 demux.audio_0 ! queue ! decodebin ! queue ! audioconvert ! queue ! vorbisenc ! queue ! oggmux ! queue ! filesink location=vorbis-audio.oga

	===Transmux a MKV (containing vorbis and theora) to Ogg:===		===Transmux a MKV (containing vorbis and theora) to Ogg:===
	*gst-launch filesrc location="INPUT.mkv" ! matroskademux name=d ! video/x-theora ! queue ! theoraparse ! oggmux name=mux ! filesink location="OUTPUT.ogv" d. ! audio/x-vorbis ! queue ! vorbisparse ! queue ! mux.		*gst-launch-0.10 filesrc location="INPUT.mkv" ! matroskademux name=d ! video/x-theora ! queue ! theoraparse ! oggmux name=mux ! filesink location="OUTPUT.ogv" d. ! audio/x-vorbis ! queue ! vorbisparse ! queue ! mux.

	===Encode a y4m to lossless Dirac in Ogg:===		===Encode a y4m to lossless Dirac in Ogg:===
	*gst-launch filesrc location="INPUT.y4m" ! decodebin ! schroenc force-profile=vc2_main rate-control=lossless ! oggmux ! filesink location="OUTPUT.ogv"		*gst-launch-0.10 filesrc location="INPUT.y4m" ! decodebin ! schroenc force-profile=vc2_main rate-control=lossless ! oggmux ! filesink location="OUTPUT.ogv"

	===Pull from a windows media stream, transcode to Ogg/Theora+Vorbis and send to a ~~icecast~~ server:===		===Pull from a windows media stream, transcode to Ogg/Theora+Vorbis and send to a Icecast server:===
	(may require purchasing Fluendo plugins for decoding the encumbered codecs)		(may require purchasing Fluendo plugins for decoding the encumbered codecs)
	*gst-launch uridecodebin uri=mms://SOURCE.SERVER.COM/path name=d ! queue max-size-time=100000000 ! ffmpegcolorspace ! theoraenc bitrate=800 ! oggmux name=mux ! shout2send ip=YOURICECAST.SERVER.COM port=8000 password=YOURPASSWORD mount=/OUTPUTFILENAME.ogv d. ! queue max-size-time=100000000 ! audioconvert ! vorbisenc ! mux.		*gst-launch-0.10 uridecodebin uri=mms://SOURCE.SERVER.COM/path name=d ! queue max-size-time=100000000 ! ffmpegcolorspace ! theoraenc bitrate=800 ! oggmux name=mux ! shout2send ip=YOURICECAST.SERVER.COM port=8000 password=YOURPASSWORD mount=/OUTPUTFILENAME.ogv d. ! queue max-size-time=100000000 ! audioconvert ! vorbisenc ! mux.

	===Capture video from a webcam, encode to an Ogg Theora file, decode and display on screen, write to a file whose name is the current date+time, and stream to an IceCast server===		===Capture video from a webcam, encode to an Ogg Theora file, decode and display on screen, write to a file whose name is the current date+time, and stream to an IceCast server===
Line 44:		Line 44:
	*mplayer tv:// -tv device=/dev/video0:driver=v4l2:norm=NTSC:width=320:height=240:outfmt=uyvy:input=1:buffersize=16: -ao null		*mplayer tv:// -tv device=/dev/video0:driver=v4l2:norm=NTSC:width=320:height=240:outfmt=uyvy:input=1:buffersize=16: -ao null
	*mplayer tv:// -tv device=/dev/video1:driver=v4l2:norm=NTSC:width=320:height=240:outfmt=uyvy:input=1:buffersize=16: -ao null		*mplayer tv:// -tv device=/dev/video1:driver=v4l2:norm=NTSC:width=320:height=240:outfmt=uyvy:input=1:buffersize=16: -ao null
	*gst-launch --eos-on-shutdown v4l2src device=/dev/video0 ! videoscale ! video/x-raw-yuv,width=320,height=240,interlaced=true ! queue max-size-bytes=100000000 max-size-time=0 ! gamma gamma=1.2 ! queue max-size-bytes=100000000 max-size-time=0 ! videobalance saturation=1.9 brightness=0.00 contrast=1.4 hue=0.06 ! ffmpegcolorspace ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw-yuv,framerate=15/1 ! queue max-size-bytes=100000000 max-size-time=0 ! ffmpegcolorspace ! queue max-size-bytes=100000000 max-size-time=0 ! videomixer name=mix ! queue max-size-bytes=100000000 max-size-time=0 ! ffmpegcolorspace ! queue max-size-bytes=100000000 max-size-time=0 ! theoraenc bitrate=600 ! queue max-size-bytes=100000000 max-size-time=0 ! oggmux name=mux alsasrc device=hw:1,0 latency-time=100 ! queue max-size-bytes=100000000 max-size-time=0 ! audioconvert ! vorbisenc ! queue max-size-bytes=100000000 max-size-time=0 ! mux. mux. ! queue max-size-bytes=100000000 max-size-time=0 ! shout2send ip=icecast-server.com password=hackme mount=/mountpoint.ogv v4l2src device=/dev/video1 ! videoscale ! video/x-raw-yuv,width=320,height=240,interlaced=true ! gamma gamma=1.2 ! queue max-size-bytes=100000000 max-size-time=0 ! videobalance saturation=1.9 brightness=0.00 contrast=1.4 hue=0.06 ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw-yuv,framerate=5/1 ! queue max-size-bytes=100000000 max-size-time=0 ! ffmpegcolorspace ! queue max-size-bytes=100000000 max-size-time=0 ! videobox border-alpha=0 fill=green left=-320 ! mix.		*gst-launch-0.10 --eos-on-shutdown v4l2src device=/dev/video0 ! videoscale ! video/x-raw-yuv,width=320,height=240,interlaced=true ! queue max-size-bytes=100000000 max-size-time=0 ! gamma gamma=1.2 ! queue max-size-bytes=100000000 max-size-time=0 ! videobalance saturation=1.9 brightness=0.00 contrast=1.4 hue=0.06 ! ffmpegcolorspace ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw-yuv,framerate=15/1 ! queue max-size-bytes=100000000 max-size-time=0 ! ffmpegcolorspace ! queue max-size-bytes=100000000 max-size-time=0 ! videomixer name=mix ! queue max-size-bytes=100000000 max-size-time=0 ! ffmpegcolorspace ! queue max-size-bytes=100000000 max-size-time=0 ! theoraenc bitrate=600 ! queue max-size-bytes=100000000 max-size-time=0 ! oggmux name=mux alsasrc device=hw:1,0 latency-time=100 ! queue max-size-bytes=100000000 max-size-time=0 ! audioconvert ! vorbisenc ! queue max-size-bytes=100000000 max-size-time=0 ! mux. mux. ! queue max-size-bytes=100000000 max-size-time=0 ! shout2send ip=icecast-server.com password=hackme mount=/mountpoint.ogv v4l2src device=/dev/video1 ! videoscale ! video/x-raw-yuv,width=320,height=240,interlaced=true ! gamma gamma=1.2 ! queue max-size-bytes=100000000 max-size-time=0 ! videobalance saturation=1.9 brightness=0.00 contrast=1.4 hue=0.06 ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw-yuv,framerate=5/1 ! queue max-size-bytes=100000000 max-size-time=0 ! ffmpegcolorspace ! queue max-size-bytes=100000000 max-size-time=0 ! videobox border-alpha=0 fill=green left=-320 ! mix.

	===Create a video with an alpha channel from a sequence of PNG files===		===Create a video with an alpha channel from a sequence of PNG files===
Line 61:		Line 61:
	*Tested on Version 10.6.8, newer releases not compatible with [https://github.com/davibe/osximagesrc osximagesrc]		*Tested on Version 10.6.8, newer releases not compatible with [https://github.com/davibe/osximagesrc osximagesrc]

	gst-launch --eos-on-shutdown osximagesrc ! queue max-size-bytes=100000000 max-size-time=0 ! ffmpegcolorspace ! videoscale method=4-tap ! video/x-raw-yuv, width=960, height=600 ! queue max-size-bytes=100000000 max-size-time=0 ! theoraenc bitrate=360 keyframe-auto=false keyframe-force=3 keyframe-freq=3 speed-level=0 drop-frames=false ! queue max-size-bytes=100000000 max-size-time=0 ! oggmux ! queue max-size-bytes=100000000 max-size-time=0 ! shout2send ip=host.com password=hackme mount=/mountpoint.ogv		gst-launch-0.10 --eos-on-shutdown osximagesrc ! queue max-size-bytes=100000000 max-size-time=0 ! ffmpegcolorspace ! videoscale method=4-tap ! video/x-raw-yuv, width=960, height=600 ! queue max-size-bytes=100000000 max-size-time=0 ! theoraenc bitrate=360 keyframe-auto=false keyframe-force=3 keyframe-freq=3 speed-level=0 drop-frames=false ! queue max-size-bytes=100000000 max-size-time=0 ! oggmux ! queue max-size-bytes=100000000 max-size-time=0 ! shout2send ip=host.com password=hackme mount=/mountpoint.ogv

	If the screen resolution is set to mirrored 1024x640 (?), start the following ''then'' plug in the video display cable:		If the screen resolution is set to mirrored 1024x640 (?), start the following ''then'' plug in the video display cable:
	*gst-launch --eos-on-shutdown osximagesrc ! queue max-size-time=0 max-size-bytes=100000000 ! ffmpegcolorspace ! queue max-size-time=0 max-size-bytes=100000000 ! videocrop right=256 top=32 ! queue max-size-time=0 max-size-bytes=100000000 ! videoscale ! video/x-raw-yuv, width=658, height=486 ! queue max-size-time=0 max-size-bytes=100000000 ! theoraenc bitrate=300 keyframe-auto=false keyframe-force=3 keyframe-freq=3 speed-level=0 drop-frames=false ! queue max-size-time=0 max-size-bytes=100000000 ! oggmux ! queue max-size-time=0 max-size-bytes=100000000 ! shout2send ip=host.com port=8000 password=hackme mount=/mountpoint.ogv		*gst-launch-0.10 --eos-on-shutdown osximagesrc ! queue max-size-time=0 max-size-bytes=100000000 ! ffmpegcolorspace ! queue max-size-time=0 max-size-bytes=100000000 ! videocrop right=256 top=32 ! queue max-size-time=0 max-size-bytes=100000000 ! videoscale ! video/x-raw-yuv, width=658, height=486 ! queue max-size-time=0 max-size-bytes=100000000 ! theoraenc bitrate=300 keyframe-auto=false keyframe-force=3 keyframe-freq=3 speed-level=0 drop-frames=false ! queue max-size-time=0 max-size-bytes=100000000 ! oggmux ! queue max-size-time=0 max-size-bytes=100000000 ! shout2send ip=host.com port=8000 password=hackme mount=/mountpoint.ogv

	*Streamed Keynote talks will stream the Presenter's View -- no switching between display mirrors		*Streamed Keynote talks will stream the Presenter's View -- no switching between display mirrors
Line 75:		Line 75:
	*qjackctl & → Start JACK in realtime priority		*qjackctl & → Start JACK in realtime priority
	<br />		<br />
	*gst-launch-~~'''~~1.0~~'''~~ -e rtspsrc location=rtsp://192.168.0.9:554 latency=100 ! queue max-size-bytes=100000000 max-size-time=0 ! rtpjpegdepay ! queue max-size-bytes=100000000 max-size-time=0 ! jpegdec max-errors=-1 ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw,framerate=18/1 ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw, width=1296, height=560 ! queue max-size-bytes=100000000 max-size-time=0 ! tee name=halfres ! queue max-size-bytes=100000000 max-size-time=0 ! jpegenc ! queue max-size-bytes=100000000 max-size-time=0 ! matroskamux name=mux jackaudiosrc connect=1 client-name="GStreamer Input" ! queue max-size-bytes=100000000 max-size-time=0 ! tee name=jackaudio ! queue max-size-bytes=100000000 max-size-time=0 ! vorbisenc ! queue max-size-bytes=100000000 max-size-time=0 ! tee name=vorbisaudio ! queue max-size-bytes=100000000 max-size-time=0 ! mux. mux. ! queue max-size-bytes=100000000 max-size-time=0 ! filesink location=elphel_recording_`date +%s`.mkv sync=false halfres. ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw,width=648, height=280 ! queue max-size-bytes=100000000 max-size-time=0 ! theoraenc bitrate=500 speed-level=1 ! queue max-size-bytes=100000000 max-size-time=0 ! oggmux name=livestream vorbisaudio. ! queue max-size-bytes=100000000 max-size-time=0 ! livestream. livestream. ! queue max-size-bytes=0 max-size-time=0 ! shout2send ip=host.com port=[80\|8000] password=hackme mount=/mountpoint.ogv halfres. ! videoscale add-borders=true ! queue max-size-bytes=100000000 max-size-time=0 ! videoconvert ! queue max-size-bytes=100000000 max-size-time=0 ! xvimagesink sync=false jackaudio. ! queue max-size-bytes=100000000 max-size-time=0 ! audioconvert ! queue max-size-bytes=100000000 max-size-time=0 ! alsasink		*gst-launch-1.0 -e rtspsrc location=rtsp://192.168.0.9:554 latency=100 ! queue max-size-bytes=100000000 max-size-time=0 ! rtpjpegdepay ! queue max-size-bytes=100000000 max-size-time=0 ! jpegdec max-errors=-1 ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw,framerate=18/1 ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw, width=1296, height=560 ! queue max-size-bytes=100000000 max-size-time=0 ! tee name=halfres ! queue max-size-bytes=100000000 max-size-time=0 ! jpegenc ! queue max-size-bytes=100000000 max-size-time=0 ! matroskamux name=mux jackaudiosrc connect=1 client-name="GStreamer Input" ! queue max-size-bytes=100000000 max-size-time=0 ! tee name=jackaudio ! queue max-size-bytes=100000000 max-size-time=0 ! vorbisenc ! queue max-size-bytes=100000000 max-size-time=0 ! tee name=vorbisaudio ! queue max-size-bytes=100000000 max-size-time=0 ! mux. mux. ! queue max-size-bytes=100000000 max-size-time=0 ! filesink location=elphel_recording_`date +%s`.mkv sync=false halfres. ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw,width=648, height=280 ! queue max-size-bytes=100000000 max-size-time=0 ! theoraenc bitrate=500 speed-level=1 ! queue max-size-bytes=100000000 max-size-time=0 ! oggmux name=livestream vorbisaudio. ! queue max-size-bytes=100000000 max-size-time=0 ! livestream. livestream. ! queue max-size-bytes=0 max-size-time=0 ! shout2send ip=host.com port=[80\|8000] password=hackme mount=/mountpoint.ogv halfres. ! videoscale add-borders=true ! queue max-size-bytes=100000000 max-size-time=0 ! videoconvert ! queue max-size-bytes=100000000 max-size-time=0 ! xvimagesink sync=false jackaudio. ! queue max-size-bytes=100000000 max-size-time=0 ! audioconvert ! queue max-size-bytes=100000000 max-size-time=0 ! alsasink
	<br />		<br />
	*Expect a ~50GB recording for 8hrs. of recording depending on image complexity. The Matroska recording may be viewed directly in VLC (≥2.0 recommended) and may be transcoded to commonly-used formats ''via'' [http://www.mirovideoconverter.com/ Miro Video Converter] or [http://firefogg.org/ Firefogg].		*Expect a ~50GB recording for 8hrs. of recording depending on image complexity. The Matroska recording may be viewed directly in VLC (≥2.0 recommended) and may be transcoded to commonly-used formats ''via'' [http://www.mirovideoconverter.com/ Miro Video Converter] or [http://firefogg.org/ Firefogg].
Line 155:		Line 155:

	===Mix Three Video Sources Side-by-Side-by-Side===		===Mix Three Video Sources Side-by-Side-by-Side===
	*May be sensitive to internal element-construction race conditions using gst-launch -- this is ~~largely~~ a proof-of-concept template for programming applications.		*May be sensitive to internal element-construction race conditions using gst-launch -- this is a proof-of-concept template for programming applications.
	*gst-launch-1.0 --eos-on-shutdown videotestsrc pattern=6 is-live=true ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw,framerate=15/1 ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw,width=320,height=240 ! queue max-size-bytes=100000000 max-size-time=0 ! clockoverlay halignment=1 valignment=1 shaded-background=true font-desc="Sans Bold 80" ypad=80 ! queue max-size-bytes=100000000 max-size-time=0 ! videobox border-alpha=0 fill=green left=-320 ! queue max-size-bytes=100000000 max-size-time=0 ! videomixer name=mix ! queue max-size-bytes=100000000 max-size-time=0 ! tee name=trivideo ! queue max-size-bytes=100000000 max-size-time=0 ! ximagesink sync=false videotestsrc pattern=22 ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw,framerate=15/1 ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw,width=320,height=240 ! queue max-size-bytes=100000000 max-size-time=0 ! mix. videotestsrc is-live=true ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw,framerate=15/1 ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw,width=320,height=240 ! queue max-size-bytes=100000000 max-size-time=0 ! videobox border-alpha=0 fill=blue left=-640 ! queue max-size-bytes=100000000 max-size-time=0 ! mix.		*gst-launch-1.0 --eos-on-shutdown videotestsrc pattern=6 is-live=true ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw,framerate=15/1 ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw,width=320,height=240 ! queue max-size-bytes=100000000 max-size-time=0 ! clockoverlay halignment=1 valignment=1 shaded-background=true font-desc="Sans Bold 80" ypad=80 ! queue max-size-bytes=100000000 max-size-time=0 ! videobox border-alpha=0 fill=green left=-320 ! queue max-size-bytes=100000000 max-size-time=0 ! videomixer name=mix ! queue max-size-bytes=100000000 max-size-time=0 ! tee name=trivideo ! queue max-size-bytes=100000000 max-size-time=0 ! ximagesink sync=false videotestsrc pattern=22 ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw,framerate=15/1 ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw,width=320,height=240 ! queue max-size-bytes=100000000 max-size-time=0 ! mix. videotestsrc is-live=true ! queue max-size-bytes=100000000 max-size-time=0 ! videorate ! video/x-raw,framerate=15/1 ! queue max-size-bytes=100000000 max-size-time=0 ! videoscale ! video/x-raw,width=320,height=240 ! queue max-size-bytes=100000000 max-size-time=0 ! videobox border-alpha=0 fill=blue left=-640 ! queue max-size-bytes=100000000 max-size-time=0 ! mix.